# -*- coding:utf-8 -*-
# @Time: 2020/9/19 9:51
# @Author: 周铖鑫
# @Description：Bar柱状图
# @File: UseBar.py
import  matplotlib.pyplot as plt
import  numpy as np
n=12
X=np.arange(n)
Y1=(1-X/float(n))*np.random.uniform(0.5,1.0,n)
Y2=(1-X/float(n))*np.random.uniform(0.5,1.0,n)
plt.bar(X,+Y1,edgecolor='white')
plt.bar(X,-Y2,edgecolor='white')
for x,y in zip(X,Y1):
    #ha:horizontal alignment   va:vertical alignment
    plt.text(x,y+0.05,'%.2f'%y,ha='center',va='bottom')

for x,y in zip(X,Y2):
    #ha:horizontal alignment   va:vertical alignment
    plt.text(x,-y-0.2,'%.2f'%-y,ha='center',va='bottom')
plt.xlim(-0.5,n)
plt.xticks(())
plt.ylim(-1.25,1.25)
plt.yticks(())
plt.show()